The answer is: 879 x 8= 7,032
The estimate is: 7,200 because when you estimate you have to estimate the first number (which is 879) to do the nearest hundredths (which is 900) and so you do 900x8 which equals 7,200.
Hint: If you answer your equation like 1894x2, and then you have to estimate your number and you estimate the answer to 1894x2 because you think that would be the answer then you're wrong.
You always have to estimate like 1894 to the nearest hundredths, then multiply it by the 2.
Hope this helped! :D
